행복하고 소박하게 살 수 있는 길

IP로 hostname 찾기

IT/IT 일반 2013. 4. 10. 15:39

cmd 창에서

nbtstat -A ***.***.***.***

위 명령어로 IP 주소로 컴퓨터이름을 얻어올 수 있다. 다만 netbios 기반으로 돌기 때문에 네트워크 단위를 넘어설 수 없다.

저작자표시 (새창열림)

Posted by lI헐헐Il

,

FileStream -> MemoryStream -> FileStream

IT/C# 2013. 3. 21. 14:18

FileStream fs = File.OpenRead(filePath);

MemoryStream ms = new MemoryStream();
ms.SetLength(fs.Length);

fs.Read(ms.GetBuffer(), 0, (int)ms.Length);
fs.Close();
			

fs = File.OpenWrite(filePath + ".bak");
ms.WriteTo(fs);

fs.Close();
ms.Close();
fs = null; ms = null;

저작자표시 (새창열림)

Posted by lI헐헐Il

,

XmlDocument SelectNodes XPath

IT/C# 2013. 3. 21. 13:27

<?xml version="1.0" encoding="utf-8" ?>
<Persons>
  <Person name="John Smith">
    <Age>30</Age>
    <Gender>Male</Gender>
  </Person>
  <Person name="Mike Folley">
    <Age>25</Age>
    <Gender>Male</Gender>
  </Person>
  <Person name="Lisa Carter">
    <Age>22</Age>
    <Gender>Female</Gender>
  </Person>
  <Person name="Jerry Frost">
    <Age>27</Age>
    <Gender>Male</Gender>
  </Person>
  <Person name="Adam Wong">
    <Age>35</Age>
    <Gender>Male</Gender>
  </Person>
</Persons>

XPath Query	Description
.	Selects the current node.
..	Selects the parent of the current node.
*	Selects all the child of the current node.
/	Selects the root nodes.
//	Selects nodes from the current node that match the selection expressions no matter where they are.
//*	Selects all elements in the document.
/element	Selects the root element named element. Staring a path with a / means you are using an absolute path to an element.
/element/*	Selects all the child of the root element.
element/*	Selects all the child nodes of a child element.
element/child	Selects the child elements which are a child of a sprecified child element of the current node.
//element	Selects all elements with the specified name regardless of where they are in the document.
element/child	Selects the child elements which are a child of a specified child element of the current node.
//element	Selects all elements with the specified name regardless if where they are in the document.
element//child	Selects all child elements of the parent regardless of where they are in the document.
@attribute	Selects an attribute of the current node where attribute is the name of the attribute.
//@attribute	Selects all the attributes specified by its name regardless of where they are in the document.
@*	Selects all attribute of the current node.
element[i]	Selects an element with the specified element name and the specified index.
text()	Selects the text of all the child nodes of the current element.
//text()	Selects text of every element in the document.
//element/text()	Selects the text of all the matching elements.
//element[name='value']	Selects the text of all the matching elements.
//elements[@att='value']	Selects all elements with the specified attribute having the specified value.

FileStream fs = new FileStream("...경로", FileMode.Open, FileAccess.Read);
XmlDocument xDoc = new XmlDocument();
xDoc.Load(fs);
XmlNodeList xNodes = xDoc.SelectNodes("/Persons/Person"); // SelectNodes의 xPath 사용법을 알아둘 것!!

if(xNodes[0] != null) // SelectNodes 후에는 선택해온 값이 있는지 확인부터 할것. 
{                           //  아닌 경우 NullReference 예외가 발생할 수 있음.
          // To do:
         string strTmp = xNodes[0].Attribute["name"].Value;
}

fs.Close(); fs = null;